Film and film-sprocket.



O. J. HOLMES.

FILM AND HLM SPROCKET.

APPLICATION FILED MAY 27( I918.

Patented A 11. 8, 1919.

RUGTZ/ZZUZT I 056a) kfffawzw,

OSCAR J. HGLMES, OF CHICAGO, EFL-111N015.

FILM AND FILM'SPPIOCKET.

Specification (if-Letters Patent.

Application filed May 27, 19 18. Serial Ho. 238,670.

1 (1 all whom it may concern:

Be it known that l. Oscar: .l. HOLMES. a citizen of the United States of America. and a resident of Chicago, in the county of Cook. State of Illinois. have invented certain new and useful lmproveu'ients in Films and Filnri'lprockets. of which the following is a specification. i

This invention relates to the picture film and the feeding mechanism for the same. of a motion picture machine, and has for its object:

To provide a structural arrangement of the sprocket orifices ot' a motion picture film, and a complementary arrangement of the sprocket teeth of the film supply, and film feeding sprocket drums. by means of which the surreptitious or unintentional use of an ordinary inflammable picture film in a successful manner is prevented by a trans verse tearing of said film in the initial movement of the same through the presentv structure. At. the same time the present formation oi" the film does not interfere with the use of the film in a motion picture feeding; mechanism of a standard formation, all as will hereinafter more fully appear.

In he accon'ipanying drawin z-- Figure l, is a detail side elevation of the picture film and the usual sprocket drums by which it is fed past the light aperture of a motion picture machine.

Fig. 2 is an end elevation oi? the same with parts removed and in section.

Fig. 3 is an elevation of a modified form of the present picture film.

Like reference numerals indicate like parts in the dilierent. views.

Referring to the drawing 1 designates the motion picture film or web. 2 designates the film supply sprocket drum by which the film drawn from a reel or magazine and fed in a continuous manner to the associated film i: ,Jding means, i-i designates the film feeding sprocket drum of the usual intermittent film feeding type, and l designates the film take-up sprocket drums. of a motion. picture machine. The said drums *2. 3 and 4 are arranged in any usual and suitable manner in relation to each other adapted for siuiultaiwous operation from a common driving source. either manual or power driven. v

in the present iuu'u'ovement. 5 designate outer rows of sprocket orifices forn'ied in the respective marginal portions of the picture film or web 1, and preferably having the standard arrangement as to the spacing of the orifices of arch row and as to the distance separating the respective rows. The sprocket orifices 5 are adapted for operative engagement with two sets oi sprocket teeth 3 and at on the aforesaid fihn feeding and film take-up drums 3 and 4, and said sets oi sprocket teeth 3 Will. preferably l'iare a standard spacing and separation corresponding to that of the sprocket orifices above described.

6 designates inner rows ot sprocket orifices formed in the picture film or Web 1 and in the spaces between the series of pictures on said film. Said orifices 6 are a. distance irside the above described outer series oi oritices 5, and in the preferred arrangement the orifices oi? one row has a staggered or noted relation to the orifices of the compan ion row, in order that a minimum number oil the sprocket orifices may occur in transverse relation thus avoiding an undue weakening of the nhn. Said sprocket orifices 6 adapted for operative engagement with the sprocket teeth 2 of the aforesaid tlln'i supply drum 2, and will have cireurnferent ii spacing correspondingto the spacing the orifices 6 aforesaid.

In actual use. the sprocket teeth 3 4 oi the drums '3, 4, are individual to the outer rows of sprocket orifices 5-01 the picture film 1 and are adapted to effect the internattent feed of said film past the aperture plate of the machine and a subsequent'take-np of the film, as usual in motion picture machines of the intern'iittei'it' film feeding type. The s 'u-ocket. teeth :2 of the film supply drum 2 are individual to the inner rows of sprocket orifices G of the picture film 1, and a adapted to draw the film from its reel magazine and feed said film in a continuous manner and in the form of a free loop to the associated intermittent film -feedingmeans of a motion picture machine.

lVith the present construction, when the use of an iu'iproper motion picture film of the standard tormation attempted, no operative eugzagremei'it of the film supply sprocket drum 2 with said film cantata place. and accordingly the operation or drawing the film from reel or must i and the ta'mtinuous 'i'eeding of the the form of a loop to the n'iotion pic}. .ie mechanisn'i will not take place, quen'ce. such operative stress will he in on the intermittent film feeding drum 3, which owing to its rapid intermittent rotation is sure to effect an immediate tearing of the picture film.

aving thus fully described my said invention What I claim as new and desire to secure by Letters Patent, is:-

1. In a motion picture mechanism, the combination of a motion picture film formed with rows of outer marginal sprocket orifices and with a row of inne'rsprocket orificesarranged between pictures of the series on the film, an intern'iittent film feeding drum ha vingsprocket teeth correspomling with and adapted for operative engagement with said outer rows of orifices of the film, and a film supply drum having sprocket teeth corresponding with andatlaptetl for operative engagement with the inner row of orifices of the film, substantiallv as set forth.

2. In a motion picture mechanism, the combination. of a motion picture film formed with rows of outer marginal sprocket orifices antwith a plurality of rows of inner sprocket orifices arranged between pictures of the serietj en the film, an intermittent film feeding tlrum' having sprocket teeth corresponding with and adapted for operative engagement with the outer rows of orifices of the film, and a film supply drum having sprocket teeth e0rresponding with and adapted for operative engagen'ient with the inner rows of orifices of the film, substantially as set forth.

3. In a motion picture mechanism, the combination of a motion picture film formed with roivs of outer marginal sprocket orifices and with a plurality of rows of inner sprocket orifices arranged in alternated relation to each other between pictures of the series on the film, an intermittent film fee ling (ll'lllll having sprocket. teeth corresponding with and adapted for operative engage ment with the outer rows of orifices of the tilm,v and a film supply drum having sprocket teeth corresponding with and adapted for operative engagement with the inner rows of orifices of the film substantially as set forth.

Signed at- Chicago, Illinois, this 22nd day of May, 1918.

OSCAR J. HOLMES. 

